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SAE-AISI 1140 Steel vs. S17700 Stainless Steel

Both SAE-AISI 1140 steel and S17700 stainless steel are iron alloys. They have 74% of their average alloy composition in common. There are 31 material properties with values for both materials. Properties with values for just one material (4, in this case) are not shown.

For each property being compared, the top bar is SAE-AISI 1140 steel and the bottom bar is S17700 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 170 to 180
180 to 430
Elastic (Young's, Tensile) Modulus, GPa 190
200
Elongation at Break, % 14 to 18
1.0 to 23
Fatigue Strength, MPa 230 to 370
290 to 560
Poisson's Ratio 0.29
0.28
Shear Modulus, GPa 72
76
Shear Strength, MPa 370 to 420
740 to 940
Tensile Strength: Ultimate (UTS), MPa 600 to 700
1180 to 1650
Tensile Strength: Yield (Proof), MPa 340 to 570
430 to 1210

Thermal Properties

Latent Heat of Fusion, J/g 250
290
Maximum Temperature: Mechanical, °C 400
890
Melting Completion (Liquidus), °C 1460
1440
Melting Onset (Solidus), °C 1420
1400
Specific Heat Capacity, J/kg-K 470
480
Thermal Conductivity, W/m-K 51
15
Thermal Expansion, µm/m-K 13
11

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 7.0
2.3
Electrical Conductivity: Equal Weight (Specific), % IACS 8.1
2.7

Otherwise Unclassified Properties

Base Metal Price, % relative 1.8
13
Density, g/cm3 7.8
7.7
Embodied Carbon, kg CO2/kg material 1.4
2.8
Embodied Energy, MJ/kg 18
40
Embodied Water, L/kg 46
150

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 89 to 93
15 to 210
Resilience: Unit (Modulus of Resilience), kJ/m3 310 to 870
460 to 3750
Stiffness to Weight: Axial, points 13
14
Stiffness to Weight: Bending, points 24
25
Strength to Weight: Axial, points 21 to 25
42 to 59
Strength to Weight: Bending, points 20 to 22
32 to 40
Thermal Diffusivity, mm2/s 14
4.1
Thermal Shock Resistance, points 18 to 21
39 to 54

Alloy Composition

Aluminum (Al), % 0
0.75 to 1.5
Carbon (C), % 0.37 to 0.44
0 to 0.090
Chromium (Cr), % 0
16 to 18
Iron (Fe), % 98.4 to 98.9
70.5 to 76.8
Manganese (Mn), % 0.7 to 1.0
0 to 1.0
Nickel (Ni), % 0
6.5 to 7.8
Phosphorus (P), % 0 to 0.040
0 to 0.040
Silicon (Si), % 0
0 to 1.0
Sulfur (S), % 0.080 to 0.13
0 to 0.030